7-(condensed n-containing heterocyclic carbonamido) cephalosporanic acid and derivatives thereof



United States Patent 3,360,515 7-(CONDENSED N-CONTAINING HETEROCYCLIC CARBONAMIDO) CEPHALOSPORANIC ACID AND DERIVATIVES THEREOF Tadayoshi Takano, Hirakata, Kiyoshi Hattori, Ibaragi,

and Teiji Kishirnoto, Kyoto, Japan, assignors to Fujisawa Pharmaceutical 'Co., Ltd., Osaka, Japan, a Japanese company No Drawing. Filed July 20, 1965, Ser. No. 473,482 Claims priority, application Japan, July 24, 1964, 39/42,267 7 Claims. (Cl. 260-243) This invention relates to 7-(condensed N-containing heterocyclic carbonamido) cephalosporanic acid and derivatives thereof, which compounds are useful as antimicrobial agents.

The compounds of this invention may be represented by the following general formula (I):

wherein R is a benzene-condensed N-containing heterocyclic radical which is substituted or unsubstituted with halogen atom, nitro, lower alkyl, lower alkoxy or haloaryl radical; n is an integer from 0 to 1; Y is lower alkylene which may contain sulfur atom in its chain; R is acetoxy, pyridinium, azido or guanidium group; M is hydrogen atom, a pharmaceutically acceptable non-toxic cation or an anionic charge.

As used herein the term benzene-condensed N-containing heterocyclic radical is intended to mean groups containing one to three nitrogen atoms, and it includes indolyl, isoindolyl, lH-indazolyl, benzimidazolyl, 1H- benzotriazolyl, ZH-benzotriazolyl, quinolyl, 1,2-dihydrol-oxoisoquinolyl, isoquinolyl, quinoxalinyl, quinazolinyl or cinnolinyl, each of which is substituted or unsubstituted with halogen atom, nitro, lower alkyl, lower alkoxy or haloaryl radical.

In the above Formula I, when M is a pharmaceutically acceptable non-toxic cation it includes, for example, an alkali metal ion such as the sodium or potassium ion, the ammonium ion and an organic quaternary ammonium cation such as triethylammonium, dicyclohexylammonium, diphenylenediammonium or dibenzylethylenediammonium.

The compound of Formula I of this invention may be prepared by reacting 7-aminocephalosporanic acid or a derivative thereof having the general Formula II:

s NHzCH-C JHi oo-N C-CH2R2 f oooM (II) with a condensed N-containing heterocyclic carboxylic acid having the general Formula III:

or a reactive derivative thereof, wherein R R Y, M and n have the same meanings as defined for formula I.

'EXamples of the carboxylic acid of the above Formula III are, in concrete, 2-methylindole-3-(methylthioacetic acid), 2-methyl indole-3-acetic acid, indole-3-acetic acid, indole-3- (methylthioacetic acid), 1H indazole 3 carboxylic acid, lH-indazole-B-acetic acid, benzimidazole-2- acetic acid, benzimidazole 2 propionicacid, 2 methyl- "ice benzimidazole-S-acetic acid, 2 methylbenzimidazole 6- acetic acid, lH-benzotriazole-l-acetic acid, lH-benzotriazole-l-n-butyric acid, 4-nitro-lH benzotriazole-l-acetic acid, 2H-benzotriazole-2 acetic acid, quinoline 2 carboxylic acid, 2-(4-chlorophenyl) quinoline-4-carboxylic acid, 1,Z-dihydro-l-oxoisoquinoline-3-carboxylic acid, 1,2- dihydro-1-oxoisoquinoline-3-acetic acid, quinoxaline- 6- carboxylic acid, quinoxaline-G-acetic acid, 2,3-dimethoxyquinoxaline-6-acetic acid, 2,3-dichloroquinoxaline-6-carboxylic acid and so forth.

7-aminocephalosporanic acid (7 amino 3 acetoxymethyl-3-cephem-4-carboxylic acid) which is one of the starting materials of Formula II is a known compound and can be obtained by the hydrolysis of the antibiotic Cephalosporin C [Biochemical Journal 79, 408-416 (1961)].

When using a condensed N-containing heterocyclic carboxylic acid, the reaction is preferably carried out in the presence of a condensing agent such as dicyclohexylcarbodiimide, N-cyclohexyl-N-morpholinoethylcarbodiimide, pentamethylene-ketene-N-cyclohexylimine, N ethyl ophenyl-isoxaZolium-3'-sulphonate, phosphorus trichloride, etc. Under such circumstances, it is believed that the reaction may mainly proceed through an active form of the carboxyl radical in the condensed N-containing heterocyclic acid or of the amino radical in the 7 -aminocephalosporanic acid.

Examples of the reactive derivatives of the condensed N-containing heterocyclic carboxylic acid to be frequently used are the acid halide, acid azido, mixed acid anhydride with alkylphosphoric acid or alkylcarb-onic acid, acid amide with imidazole or 4-substituted imidazole, acid cyanomethyl ester, acid p-nitrophenyl ester and so forth. These reactive derivatives are suitably selected in accordance with the kinds of condensed N-containing heterocyclic carboxylic acid to be used.

The reaction is usually carried out in the presence of a solvent. As a suitable solvent may be mentioned acetone, dioxane, acetonitril'e, chloroform, ethylene chloride, tetrahydrofuran, or other organic solvents which are inert in the reaction and are used commonly. Of these solvents, the hydrophylic ones may be used with water.

Also, the reaction may be carried out in the presence of a base such as an alkali metal hydrogen carbonate, trialkylamine, pyridine, etc. The reaction is carried out in most cases under cooling or at room temperature though the temperature is not particularly limited.

After completion of the reaction, the reaction product is separated according to conventional methods known in the art.

When using the compound of Formula II wherein M is a pharmaceutically acceptable non-toxic cation as a starting compound, the object compound of Formula I wherein M is hydrogen is mainly obtained, because dissociation of the cation tends to occur during the separation of the reaction product. Therefore, if it is desired to obtain the object compound of Formula I wherein M is a pharmaceutically acceptable non-toxic cation, the compound of Formula I wherein M is hydrogen is treated with an appropriate compound such as sodium hydroxide, potassium hydroxide, sodium u-ethylhexanoate, triethylamine, dicyclohexylamine, diphenylenediamine or dibenzylethylenediamine.

Inaddition, the compound of Formula I wherein R is pyridinium, azido or guanidinium may be obtained by reacting the compound of Formula I wherein R is acetoxy, with pyridine, sodium azide or guanidine.

Both 7-aminocephalosporanic acid or a derivative thereof of Formula II to be used in the reaction of this invention and the product compound of Formula I are comparatively unstable and tend to decompose during the reaction. Therefore, it is preferable to carry out the reaction and separation under mild conditions.

The resulting compound of Formula I not only demonstrates resistance to penicillinase and an acid, but exhibits advantageous physiological properties and activity against a wide variety of micro-organisms. Also the compound of Formula I shows high blood levels after oral administration to mice.

The following examples will illustrate the compounds available in accordance with this invention.

In the examples, MIC means a minimum inhibitory concentration which is measured by the serial dilution method commonly employed in bioassay of antimicrobial compounds, and Escherichia coli and Staphylococcus aureus are referred to as E. coli and "St. aureus, respectively.

Example 1 (i) 7-(indole-3-methylthioacetamido) cephalosporanic Dicyclohexylcarbodiimide (6.4 g.) in 20 cc. of tetrahydrofuran was added dropwise to 7.072 g. of indole-3- (methylthioacetic acid) in 140 cc. of tetrahydrofuran, and stirred for 30 minutes at room temperature. To this solution were added dropwise 8.704 g. of 7-aminocephalosporanic acid and 2.688 g. of sodium hydrogen carbonate in 160 cc. of water within 5 minutes, and after standing overnight stirred for 2 hours at room temperature and then for a day. The reaction mixture was then filtered and the filtrate was distilled to remove tetrahydrofuran. The remainder was further filtered, and the resulting filtrate was extracted with ethyl acetate after adjusting the pH to 1.0. The extract was distilled to remove the solvent and the remainder was dissolved in 30 cc. of acetone. This acetone solution was filtered, and acetone was distilled off. Thus obtained remainder was washed with ether to obtain 5.607 g. of 7-[indole-3- (methylthioacetamido)] cephalosporanic acid as faint yellow powders.

MIC: E. cli 40 'y/cc., St. aureus 1 v/cc.

Effectiveness of the substance above obtained in doses of 6 mg. against Diplo'coccus p enumoniae III infection in mice and Streptococcus hemolytz'cus S-23 infection in mice, was 1.33 times and 1.25 times as potent as that of 6 methyl 3 phenylisoxazole 4 carbonamido) penicillanic acid in same doses, correspondingly.

(ii) Dicyclohexylamine salt of 7-(indole-3-methylthioacetamido) cephalosporanic acid:

om-s-om-ooNnlf O N CHEO o 0 CH3 o OOH- N- H 4 C,59.52; H, 6.81; N, 8.42. Found: C, 59.28; H, 6.77; N, 8.44.

UV: ijjg 222 my, E 585; 272 my, E 171.

5 MIC: E. coli 40 'y/CC., St. aureus 0.25 w/cc.

Example 2 (i) 7-(lH-benzotriazole-l-acetamido) cephalosporan- 10 ic acid:

l S CH2CONH;[:( 1

0 01110 c 0 on;

s (hHr-CONHU OHzO o 0 OH;

The substance (395 mg.) obtained in (i) in 20 cc. of aqueous acetone and 200 mg. of dicyclohexylamine were treated in the same way as described in (ii) of Example 1 to obtain 212 mg. of dicyclohexylamine salt of 7-(1H- benzotriazole-l-acetamido) cephalosporanic acid as colorless needles having M.P. 205-206" C. (dec.).

UV: igig 260 m E 241.

MIC: E. coli 20 'y/CC., St. aureus 0.5 'y/cc.

Example 3 (i) 7-(5-methyl-lH-benzotriazole-l-acetamido) cephalosporanic acid:

l COOH CHBO CO CH;

S-methyl-lH-benzotriazole l-acetic acid (382 mg.)

dissolved in 2 cc. of tetrahydrofuran solution containing dicyclohexylcarbodiimide (215 mg./cc.) was treated with 540 mg. of 7-aminocephalosporanic acid and 180 mg.

of sodium hydrogen carbonate in 10 cc. of tetrahydrofuran and 10 cc. of water in the same way as described in (i) of Example 1 to obtain 145 mg. of 7-(5-methyllH-benzotriazole-l-acetamido) cephalosporanic acid.

(ii) Dicyclohexylamine salt of 7-(5-methyl-1'I-I-benzotriazole-l-acetamido) cephalosporanic acid:

CH IT The substance (145 mg.) obtained in (i) and 72 mg. of dicyclohexylamine were treated in the same way as described in (ii) of Example 2 to obtain 147 mg. of dicyclohexylamine salt of 7-(5-methyl-lH- benzotriazole-1- acetamido) ccphalosporanic acid as powders having MJP. 172-173 c. (dec.).

UV: AZEQ 265 E 195.

MIC: E. coli 40 7/00., St. aureus 1 'y/cc.

Example 4 (i) 7-(7-nitro-lH-benzotriazole-l-acetamido) cephalosporanic acid:

f N I S N02 CHQCONH:II

( JOOH l I S N02 CH2-C 0 NED 0 N onto 0 00m The-substance (157 mg.) obtained in (i) and 62 mg. of dicyclohexylamine were treated in the same way as described in (ii) of Example 1 to obtain 35 mg. of dicyclohexylamine salt 7-(7-nitro-lH-benzotriazole-l-acetamido) cephalosporanic acid as powders having M.P. 186-187 C. (dec.).

uvsxgig m 304 m,., E 148.

MIC: E. coli 40 7/... 31...... 0.25 'y/cc.

Example 5 (i) 7-(2H-benzotriazole-2-acetamido) cephalosporanic acid:

| s N-cmc 0 NH \N/ COOH CHzOG 0 CH3 2H-benzotriazole-2-acetic acid (443 mg.) in 2.5 cc. of tetrahydrofuran solution containing dicyclohexylcarbodiimide (211 mg./cc.) was treated with 680 mg. of 7 aminocephalosporanic acid and 227 mg. of sodium hydrogen carbonate in 10' cc. of tetrahydrofuran and 10 cc. of water in the same way as described in (i) of Example 1 to obtain 306 mg. of 7-(2H-benzotriazole-Z-acetamido) cephalosporanic acid as powders.

(ii) Dicyclohexylamine salt of 7-(2H-benzotriazole-2- acetamido) cephalosporanic acid:

CHaOCOCHa The substance (306 mg.) obtained in (i) and 163 mg. of dicyclohexylamine in 5 cc. of aqueous acetone were treated in the same way as described in (ii) of Example 1 to obtain 236 mg. of dicyclohexylamine salt of 7-(2H- benzotriazole-Z-aoetamido) cephalosporanic acid as colorless needles having M.P. 197-199 C. (dec.).

ovmgfigf 213 E290. viii 267.2m,., E

265; 279.5 my, E 274.; 286 m E 206 MIC: E. coli 20 y/cc., St. aureus 0.5 'y/cc.

Analysis.--Calculated for C H N O S: C, 58.76; H, 6.58; N, 13.71. Found: C, 59.06; H, 6.86; N, 13.59.

Example 6 (i) 7-(5-chloro 1H benzotriazole-l-acetamido) cephalosporanic acid:

c1- 17 N N/ s oH,0oNE l OLN 01120000113 COOH S-chloro-lH-benzotriazole-l-acetic acid (423 mg.) in 2 cc. of tetrahydrofuran solution containing dicyclohexylcarbodiimide (215 mg./cc.) was treated with 540 mg. of

F 7-aminocephalosporanic acid and mg. of sodium hydrdogen carbonate in 10 cc. of tetrahydrofuran and 10 cc. of Water in the same way as described in (i) of Example 1 to obtain 286 mg. of 7-(5-chloro-1H-benzotriazole-l-acetamido) cephalosporanic acid.

(ii) Dicyclohexylamine salt of 7-(5-chloro-1H-benzotriazole-l-acetamido) cephalosporanic acid:

8 4-nitro-lH-benzotriazole-l-acetic acid (444 mg.) in 0.2 cc. of tetrahydrofuran solution containing dicyclohexylcarbodiimide (215 mg./cc.) was treated with 540 mg. of 7-aminocephalosporanic acid and 180 mg. of so- 01- N 5 dium hydrogen carbonate in cc. of tetrahydrofuran and U 10 cc. of water, in the same way as described in (i) of \N/ Example 1 to obtain 214 mg. of 7-(4-nitro-1H-benzo- /s triazole-l-acetamido) cephalosporanic acid. CH1CONH i (ii) Dicy-clohexylamine salt of 7-(4-nitro-1H-benzotriazole-l-acetamido) cephalosporanic acid: N CH 0000113 10 The substance (286 mg.) obtamed 1n (1) and 120 mg. of dicyclohexylamine were treated in the same way as N described in (ii) of Example 1 to obtain 106 mg. of dicyclohexylamine salt of 7-(5-chloro-lH-benzotriazole-l- (IDHPCONH acetamido) cephalosporanic acid having M.P. 172173 l i I C. (dec.). V 01120000113 UV: 13 H5011 265 m E 206.6

MIC: E. 00 11 40 7/00., St. aureus 0.25 'y/cc. H

Example 7 The substance (214 mg.) obtained in (i) and 90 mg. g f 1H benzotnazole'Lacetamldo) of dicyclohexylamine were treated in the same way as ha ospommc described in (ii) of Example 1 to obtain 74 mg. of dicyclohexylamine salt of 7-(4-nitro-1H-benzotriazole-l- 1 10: acetamido) cephalosporanic acid having M.P. 181183 C. (dec.). -N

l UV: 13513 310 mu, E 113.4

| s MIC: E. coli 7/60., St. aureus 0.5 'y/cc. CH2CONH O I L L Analysis.Calculated for C H O N S: C, 59.00; H,

\/ CHZOCOCHQ 6.27; N,.13.76. Found: C, 58.83; H, 6.30; N, 13.52.

| 40 The following compounds were prepared by the same COOH way as described in (i) of Example 1.

TABLE 1 MP. uv MIC (y/cc.) Compound Form C.)

(dec.) 1% E.

Solvent )\(m;1) E coli' aureus 7-(Indole-3-acetamido) cephalosporanic acid Fine 240 40 0.5

prisms.

(max 7-(2-methylindole-Ii-actamjdo) eephalosporanic acid Powders 76-82 80% ChHsOH NaOH.. 271 259 40 0.25

7-(Z-fiQthyIindo1e-3-methylthioacetamido) cephalosporanic Powders -105 80% CzHsOH NaOH. (2123K) 234 40 0.25

M (max.) 7-(lH-indazole-3-acetamid0) cephalosporanic acid Powders-- -135 Tetrahydroiuran 5 40 0.4

(max) 7-[1H-benzotriazo1e-1-(S-n-butanamido)] cephalosporanic acid-" 81-80 80% C1H5OH NBOBL. 258. 5 349 40 2, 5

ma 7-(2,3-dimethoxyquinoxaline-fi-aeetamido) cephalosporanic acid. Powders 161-165 80% C1H5OH NBOH" gg 40 1 (max 7-(2,3-dichloroquinoxaline-G-acetamido) cepha10sporanicac1d Powdersn- 169-170 Tetrahydroiuran 40 0.2

(1111.) 7-(1,2-dihydr0-1-0x0isoquinoline-S-carbonamido) cephalospor- Powders" -130 80% C HgOH NaOH. 241 298 40 8 anie acid. 252 283. 6

(max) 9 Example 8 The substance (500 mg.) obtained in (i) of Example 1 was dissolved in 6 cc. of water and 4 cc. of pyridine, and -l p y quinoline-4-cafbonamidol P- allowed to stand for 45 hours at 40 C. The reaction halosporanic acid: mixture was condensed under reduced pressure, and the 5 residue was dried and washed with acetone to obtain 240 CONH 8 mg. of powders. These powders were extracted with 7 cc. of'water and condensed under reduced pressure. The 0 N gmococc, residue was washed with acetone to obtain 7-[indole-3- C1 (methylthioacetamido)] 3 pyridiniummethyl decep- COQH 10 halosporanic acid inner salt as faint yellow powders having M.P. 120130 C. (dec.).

N UV: 333 269 my, E 172 7-aminoccphalosporanic acid (540 mg.) was dissolved MIC: 40 St aureus in 0.5 cc. of triethylamine and 20 cc. of chloroform. Y 7 To this solution was added 2-(4-chlorophenyl) quinoline- The following compound was prepared by the same 4-carbonyl chloride prepared from 567 mg. of 2-(4- way as described above.

' TABLE 3 UV MIC('y/CC.) 1n.p. Compound Form C.) (dee) Solvent A 1% E E. St.

(m 1 cm. colt. aureus 7-(lH-benzotriazole-l-acetamldo)-3-pyridlnium-methyldecephalosporanic acid inner salt. Yellow Powders" 161-165 11 0 258 277.4

chlorophenyl) quinoline-4-carboxylic acid and thionyl Example 10 chloride, and stirred for an hour under cooling and then for an hour at room temperature. Afterv allowing to stand Sodium salt of 7-[1 d0 6- y ml overnight, the reaction mixture was adjusted to pH 3.0 p sp m a v with hydrochloric acid, and chloroform layer was condensed. The remainder was dissolved in acetone, and to S this acetone solution was added ether. The resulting pre- CH2-SCH:CONH

cipitate was collected by filtration and washed with petroleum ether to obtain 177 mg. of 7-[2-(4-chlorophenyl) \N O CHzOCOCHa quinoline-4-carbonamido] cephalosporanic acid as powders havingMP. 105-112" C. (dec.).

v UV: AgZQ 265 mu, 13371.7 v The substance (200 mg.) obtained in (i) of Example coll 40 7/06" aureus 40 1 was dissolved in 5 cc. of acetone. To this acetone solu- The following compounds were prepared by the same 5 tion was added mg. of sodium tit-ethyl hexenoatein 11 40 OOONa way as described above. 1 cc. of acetone and allowed to stand overnightin an ice- TABLE} UV M10 /00.)

' Compound Form ('C.)

(dec.) 1% E. St.

Solvent (my) E cult aureus (max.) 7-(1H-Indaz0le-3-carbonamido) cephalosporanic acid Powders -137 Tetrahydrofnran 40 10 (max.) 7-(2,3diehloroqulnoxaline-(tcarbonamido) cephalosporanic acid- Powders 180-190 80% C H OH NaOH :2 40 40 (mam) 7-(Quinoline-2rcarbonamido) cephalosporanic acid Powders 92-102 80% CgHgOH Na0H- 239 1,070 40 10 Example 9 box to obtain 2 g. of sodium salt of 7-[indole-3-(methyl- 7 [ind01e 3 (methylthioacetamido)1 3 Pyridinium thioacetamido)] cephalosporanic acid as colourless crysmethyl-decephalosporanic acid inner salt: tals having J oHr P 1-( L UV: x53; 260 m, E 137 o N W H g l/ 0 PO The following compound was prepare by the same way 75 as described above.

TABLE t UV F Com onnd orm p (dec.) Solvent (my) 1% E Sodium salt of 7-(1H-benzotrlazo1e-l-acetamide) cephalosporanic acld. 212-214 95% 0 115013- (1152:.) 325. 1

Example 11 7-(indole 3 methylthioacetamido) 3 azidomethyldecephalosporanic acid:

s onhs-onhoormfi N CHz-N;

1 COOH The substance (120 mg.) obtained in (i) of Example 1 and 40 mg. of sodium azide were dissolved in 2 cc. of water and 2 cc. of acetone. After allowing to stand at 37C. for 48 hours, this solution was acidified with dil. Sulfuric acid and extracted with 4 cc. of ethyl acetate twice. The extract solution was condensed under reduced pressure, and the remainder was passed through a column filled with silica gel and eluted with chloroform. The elute was condensed under reduced pressure to obtain 34 mg. of 7-(indole-3-methylth,ioacetamido)-3-azido methyl-decephalosporanic acid having M.P. 92-98" C.

' (dec.)

MIC: E. c0li 40 y/cc., St. aureus 0.25 'y/cc., St. No. 11 (penicillin resistant strain) 0.25 1 /00.

Example 12 7 (indole 3 methylthioacetamido) 3-guanidiniummethylcephalosporanic acid inner salt:

decephalosporanic acid inner salt having M.P. 157-165 C. (dec.).

MIC: E. c0li 40 v/cc, St. aureus 20 /cc., St. No. 11 (penicillin resistant strain) 0.25 'y/cc.

We claim: 1. A compound having the general formula:

0 pyridinium, azido or guanidinium group; m is an integer from O to 1; Y is a lower alkylene group; and M is hydrogen, an alkali metal, a cyclohexylammonium group or an anionic charge.

2. 7-(1H-indazole-3-acetamido) cephalosporanic acid.

3. 7-(S-methyl-lH-benzotriazole-l-acetamido) cephalosporanic acid or the dicyclohexylamine salt thereof.

4. 7-(S-chloro-lH-benzotriazole-l-acetamido) cephalosporanic acid or the dicyclohexylamine salt thereof.

5. 7-(2,3-dichloroquinoxaline or 2,3,-dimethoxyquinoxaline-6-car bonamido) cephalosporanic acid.

6. 7-(1H or ZH-benzotriazole-l or 2-acetamido)-cephalosporanic acid or the dicyclohexylamine salt thereof.

7. 7-( 4 or 7 nitro lH-benzotriazole-l-acetamido)- ciphalosporanic acid or the dicyclohexylamine salt there- 0 References Cited UNITED STATES PATENTS NICHOLAS S. RIZZO, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,360,515 December 26, 1967 Tadayoshi Takano et al.

It is hereby certified that error appears in the above numbered pat ent requiring correction and that the said Letters Patent should read as corrected below.

Column 1, lines 20 to 25, for that portion of the formula reading "-N( IH" read C TH- columns 7 and 8, TABLE 1,

eighth column, line 2 thereof, for "0.25" read l column 9, lines 5 to 12, for that portion of the formula reading "CH OCOCC read CH OCOCH column 11, line 47, for

"quanidine" read guanidine line 51, for "-3- quanidiniummethyl" read -3-guanidiniummethyl- Signed and sealed this 25th day of February 1969.

(SEAL) Attest:

Edward M. Fletcher, Jr. EDWARD J. BRENNER Attesting Officer Commissioner of Patents 

1. A COMPOUND HAVING THE GENERAL FORMULA: 